CN109991133B - Nano-particle chemical component detection system and detection method - Google Patents
Nano-particle chemical component detection system and detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 76
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 57
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- 239000002245 particle Substances 0.000 claims abstract description 99
- 239000002184 metal Substances 0.000 claims abstract description 88
- 238000005070 sampling Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 230000001681 protective effect Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 1
- 238000012216 screening Methods 0.000 abstract description 12
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000013459 approach Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 49
- 239000013618 particulate matter Substances 0.000 description 34
- 238000003795 desorption Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention relates to a system and a method for detecting chemical components of nano-particles, belongs to the technical field of environmental monitoring, and solves the problems that in the prior art, a separation system is adopted for particle size screening and nano-particle enrichment, and the existing measurement system cannot accurately obtain the chemical components of particles with the particle size of less than 50 nm. The detection system comprises a charging device, a particle size screening-enriching unit and a detection device which are sequentially connected, wherein the particle size screening-enriching unit comprises a sampling rod, an enriching part, a metal shell and a collecting cavity, the metal shell is arranged in the collecting cavity, one end of the sampling rod is arranged outside the collecting cavity, the other end of the sampling rod is connected with the enriching part and arranged in the metal shell, and the metal shell and the enriching part are opposite to the particles in charge. The detection method comprises the following steps: introducing particulate matters, sheath gas and protective gas → adjusting voltage → switching to a heating mode, pushing the sampling rod to approach the detection device → entering the detection device for detection. The invention realizes that the single device simultaneously screens and collects the nano-particles with specific particle sizes.
Description
Technical Field
The invention relates to the technical field of environmental monitoring, in particular to a system and a method for detecting chemical components of nano-particles.
Background
At present, atmospheric particulate pollution in China is increasingly serious, and regional haze pollution caused by the atmospheric particulate pollution is widely concerned by various circles. Atmospheric particulates have important influences on human health, atmospheric visibility, regional atmospheric pollution and global climate change, and the composition of the particulates determines important factors of the environmental effect of the particulates.
The existing measurement system adopts different devices for particle size screening and enrichment of particles respectively, so that the measurement system has more devices and is complex to operate and control. Meanwhile, the chemical composition of inorganic components in the particles can not be accurately obtained by mainly measuring organic chemical components of the particles in the prior art.
In addition, the existing measurement system usually measures the particles with the particle size larger than 100nm, and the chemical composition of the particles with the particle size smaller than 50nm cannot be accurately obtained.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a system and a method for detecting chemical components of nanoparticles, which can solve at least one of the following technical problems: (1) different systems are adopted for screening and enriching the particle size of the nano particles, so that a plurality of devices are provided, and the structure is complex; (2) the chemical composition of the inorganic components in the particulate matter cannot be accurately obtained; (3) the existing measurement system usually measures the particles with the particle size larger than 100nm, and the chemical composition of the particles with the particle size smaller than 50nm cannot be accurately obtained.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the invention provides a nano-particle chemical component detection system which comprises a charging device, a particle size screening-enriching unit and a detection device which are sequentially connected; the charging device is used for charging the nano-particles; the particle size screening-enriching unit comprises a sampling rod, an enriching part, a metal shell and a collecting cavity, wherein the metal shell is arranged in the collecting cavity, one end of the sampling rod is arranged outside the collecting cavity, the other end of the sampling rod is connected with the enriching part and is arranged in the metal shell, and the metal shell and the enriching part are opposite to the nano-particles in charge; the wall of the collecting cavity is provided with a first inlet for the nano particles to pass through and a second inlet for the gas to pass through, the wall of the metal shell is provided with a third inlet, and the nano particles pass through the third inlet to be enriched on the enrichment part.
On the basis of the scheme, the invention is further improved as follows:
further, the device also comprises a first isolator and a second isolator, wherein the first isolator and the second isolator are used for isolating high voltage carried by the metal shell, the first isolator is used for isolating the metal shell and the detection device, and the second isolator is used for isolating the metal shell and the collection cavity.
Further, still include particle generator and the valve body that is used for producing the nanometer particulate matter, the valve body is located between particle generator and the lotus electric installation for realize the switching of route between the nanometer particulate matter in the atmosphere and the nanometer particulate matter that particle generator produced.
Furthermore, the end part of the metal shell far away from the detection device is provided with a fourth inlet for the protective gas to pass through, and the protective gas is used for blowing off the gas outside the nano particles.
Further, the device also comprises an air pump used for controlling the pressure in the collection cavity, and the air pump is communicated with the collection cavity.
Further, the particle counter is communicated with the collection cavity and is used for measuring the concentration of the nano particles.
Furthermore, the first inlet is arranged on the side wall of the collecting cavity, and the third inlet is arranged on the side wall of the metal shell.
Further, the voltage on the enrichment part is greater than the voltage on the metal shell.
On the other hand, the invention also provides a method for detecting the chemical components of the nano particles, which comprises the following steps:
step 1: introducing nano particles and sheath gas into the collection cavity, and introducing protective gas into the metal shell;
step 2: pushing the sampling rod to a third inlet on the side wall of the metal shell;
and step 3: opening a first power supply which provides high voltage for the enrichment part and heats the enrichment part and a second power supply which provides high voltage for the metal shell, and adjusting a high-voltage mode to enable the metal shell and the enrichment part to be charged oppositely to the nano particles; adjusting the second power supply voltage to enable the nano-particles with the selected particle size to enter the metal shell for enrichment;
and 4, step 4: switching the first power supply to a heating mode, and pushing the sampling rod to be close to the detection device;
and 5: the nano particles are converted into gas to enter a detection device for detection.
On the basis of the scheme, the invention is further improved as follows:
further, the step 1 and the step 2 also comprise opening the air pump to adjust the pressure in the collection cavity.
The invention can realize at least one of the following beneficial effects:
(1) by arranging the sampling rod, the enrichment part, the metal shell and the collection cavity, and reasonably setting the mutual position relationship and controlling the positive and negative of the charged charges, the detection system can simultaneously realize the screening and collection of the nano-particles with specific particle sizes. Particularly, the metal shell and the nano particles are controlled to have opposite charges, the sheath gas is arranged for blowing, so that the nano particles with different particle sizes are separated due to different electric mobility, and the nano particles with the selected particle sizes enter the metal shell through the inlet by arranging the inlet on the wall of the metal shell, so that the screening of the nano particles with the specific particle sizes is realized. Through setting up sampling rod and enrichment portion to take opposite electric charge through control enrichment portion and nano-particle thing, make nano-particle thing enrichment in enrichment portion, thereby realized that single equipment has particle size screening and particulate matter enrichment function, and then realized screening and collection to the nano-particle thing of specific particle size simultaneously.
(2) Through setting up first isolator and second isolator, make metal casing and collect chamber wall and detection device not all be connected, high pressure on the metal casing can not conduct collect chamber wall and detection device on, has guaranteed the security of using this system.
(3) The invention is provided with the particle generator which can generate particles with known flow and components, and whether the detection result of the system is accurate or not can be measured by comparing the detection result with the detection result of the detection device. Through setting up the valve body, can conveniently realize the switching of route between the nanometer particulate matter of nanometer particulate matter in the atmosphere and the nanometer particulate matter that particulate matter generator produced.
(4) Through set up the entry that supplies the protective gas to pass through on the metal casing to reduce or avoid the gas enrichment outside the nano-particles that need collect through letting in the protective gas on the enrichment portion, thereby improved the enrichment efficiency of enrichment portion to nano-particles and the purity of the particulate matter of enrichment.
(5) The pressure in the collecting cavity is controlled by arranging the air extracting pump, so that danger caused by overlarge pressure is avoided, and the safety of using the detection system is improved.
(6) The particle counter is arranged to measure the number concentration of the nano particles before and after enrichment, so that the enrichment efficiency is obtained, and whether the enrichment mode is switched to the desorption mode is judged according to the enrichment efficiency.
(7) By designing the sampling rod to be push-pull, switching between the enrichment mode and the desorption mode can be conveniently realized. When the nano-particles are desorbed, the sampling rod is pushed to the sample inlet of the detection device, so that the gaseous nano-particles enter the detection device as much as possible, and the detection result is more accurate.
(8) The voltage on the enrichment part is larger than that on the metal shell, so that the nano particles are easier to collect, and the enrichment efficiency of the enrichment part is improved.
(9) The system can realize continuous online particle size selection and thermal desorption of particles, realize particle size detection of chemical components of nano particles, and simultaneously realize enrichment of particles with specific particle sizes by adopting an enrichment mode, and then perform detection analysis.
(10) According to the detection method provided by the invention, the particles with the selected particle size (such as the particle size less than 50nm) can enter the metal shell for enrichment by adjusting the second power supply voltage.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of a system for detecting chemical components of nanoparticles according to an embodiment of the present invention.
Reference numerals:
1-a first high pressure gas source; 2-a second high-pressure gas source; 3-high voltage and heating current power supply; 4-a voltage controlled power supply; 5-a sampling rod; 6-a first flow controller; 7-a second flow controller; 8-a collection chamber; 9-a metal shell; 10-a detection device; 11-a charger; 12-a particulate matter generator; 13-an enrichment section; 14-a valve body; 15-particle counter; 16-a third flow controller; 17-an air pump; 18-a first isolator; 19-a second isolator; 20-a first inlet; 21-a second inlet; 22-a third inlet; 23-fourth inlet.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.
One embodiment of the invention discloses a system for measuring chemical components of nano-particles with particle sizes, which comprises a charge device 11, a particle size screening-enriching unit and a detection device 10 which are sequentially connected as shown in fig. 1.
The charger 11 is used for charging the nano-particles; the particle size screening-enriching unit comprises a sampling rod, an enriching part, a metal shell 9, a voltage control power supply 4 connected with the metal shell, a high-voltage and heating current power supply 3 connected with the enriching part and a collecting cavity 8, wherein the voltage control power supply 4 is used for applying voltage to the metal shell 9 to enable the metal shell 9 to be electrified.
The high voltage and heating current power supply 3 is used to charge the enrichment section 13 or heat the enrichment section. The metal shell 9 is arranged in the collection cavity 8, one end of the sampling rod 5 is arranged outside the collection cavity 8, the other end of the sampling rod is connected with the enrichment part 13 and is arranged in the metal shell 9, and the metal shell 9 and the enrichment part 13 are opposite to the charges of the nano particles; the lateral wall of the collection cavity 8 is provided with a first inlet 20 for the nano particles to pass through, the end part of the collection cavity far away from the detection device is provided with a second inlet 21 for the gas to pass through, the lateral wall of the metal shell is provided with a third inlet 22, and the particles pass through the third inlet to be enriched on the enrichment part. The measuring system further comprises a second high-pressure gas source 2 connected with the second inlet, and the gas in the second high-pressure gas source can be nitrogen, zero gas or other inert gases. Illustratively, the sampling rod is hollow and tubular, and the connection wires pass through the sampling rod to connect the enrichment section and the high voltage and heating current power supply 3, as shown in fig. 1.
Compared with the prior art, the measurement system that this embodiment provided is through controlling metal-back and particulate matter opposite charge, and sweep through setting up the sheath gas, make the particulate matter of different particle sizes take place the separation because of the mobility is different, through setting up the entry on the metal casing wall, make the particulate matter of selected particle size pass through inside the entry gets into the metal-back, through control enrichment portion and particulate matter opposite charge, make the particulate matter enrichment in the enrichment portion, thereby realized that same system has particle size screening and particulate matter enrichment function, and then realize screening and collecting the nano-particle thing of specific particle size simultaneously.
In order to accelerate the gas entering the collecting cavity, the number of the first inlet and the second inlet on the wall of the collecting cavity is multiple. Similarly, the number of the third inlets on the metal shell wall for the particles to pass through is also multiple, and the multiple third inlets are circumferentially arranged along the outer wall of the metal shell, even the multiple third inlets form a circular seam along the outer wall of the metal shell.
Considering the high voltage of the metal shell with kilovolts, the safety of the operation is seriously affected if the isolation is not carried out. Therefore, the present embodiment is provided with a first isolator 18 for isolating the high voltage carried by the metal shell between the metal shell and the detection device, and a second isolator 19 between the metal shell and the collection chamber. Through the design, the metal shell is not connected with the wall of the collecting cavity and the detection device, and high pressure on the metal shell cannot be conducted to the wall of the collecting cavity and the detection device, so that the safety of using the detection system is ensured.
In order to verify the accuracy of the experimental data measured by the system, the measurement system of the present embodiment is provided with a particulate generator 12 capable of generating particulate matter. The flow and the components of the particulate matters generated by the particulate matter generator are known, and whether the detection result of the system is accurate or not is measured by comparing the flow and the components with experimental data detected by the detection device. And if the detection result is not accurate, debugging and maintaining the system until the detection result is accurate, and detecting the particles in the atmosphere.
In order to facilitate switching between the particulate matter in the atmosphere and the particulate matter generated by the particulate matter generator, a valve body 14 is provided between the charger 11 and the particulate matter generating device 12 in the present embodiment. The valve body 14 can be used to selectively measure the ambient atmosphere or to measure a known flow rate and composition of particulate matter generated by the particulate matter generating device 12.
It should be noted that the enrichment part of the present invention is used for enriching the particulate matters, but during the enrichment process, the gas except the particulate matters is inevitably enriched on the enrichment part, so that in this embodiment, the fourth inlet 23 for passing the shielding gas is disposed on the metal shell, and the shielding gas is introduced into the metal shell through the first high-pressure gas source 1, and the shielding gas is used for reducing or avoiding the gas except the particulate matters to be collected from being enriched on the enrichment part, thereby improving the enrichment efficiency of the enrichment part on the particulate matters and the purity of the enriched particulate matters. Illustratively, the gas within the first high pressure gas source 1 may be nitrogen, zero air, or other inert gas.
In order to facilitate the control of the amount of gas entering the particle size screening unit and the enrichment unit, a first flow controller 6 is arranged between the first high-pressure gas source and the metal shell, and a second flow controller 7 is arranged between the second high-pressure gas source 2 and the collection cavity, so that the amount of gas entering the particle size screening unit and the enrichment unit is effectively controlled, and the particle size screening unit and the enrichment unit are prevented from being too much gas, so that the pressure is too large, and potential safety hazards are brought.
In order to further improve the safety of the measuring system, the embodiment of the invention is also provided with an air suction pump 17 communicated with the collecting cavity to control the pressure in the collecting cavity. When the gas in the collection cavity is too much, the gas in the collection cavity is pumped out by the air pump. Illustratively, a third flow controller 16 is provided between the suction pump and the collection chamber.
It should be noted that timely switching the enrichment mode to the desorption mode has a very important influence on the accuracy of the experimental data. Therefore, it is very important to grasp the switching timing. According to the invention, the particle counter 15 is arranged to measure the number concentration of particles before and after enrichment, so that the enrichment efficiency is obtained, and when the enrichment efficiency is very low, the enrichment is stopped, and thermal desorption is carried out.
Considering that thermal desorption in-process particulate matter turns into the gaseous state, if the enrichment portion still is located the position of enrichment mode, then, the gaseous of thermal desorption production can be at metal-back internal diffusion, leads to getting into the gas quantity reduction of detecting element, consequently, this embodiment is plug-type with the design of sampling rod, when needs carry out thermal desorption, before pushing forward the detecting device with the sampling rod, makes gaseous state particulate matter get into detecting device as much as possible to make the testing result more accurate.
Because the metal shell and the enrichment part are both provided with high voltage, and the voltage of the metal shell and the enrichment part is the same in positive and negative, if the voltage on the enrichment part is equal to or less than the voltage on the metal shell, charged particles are difficult to enrich on the enrichment part, and the enrichment efficiency is low. In view of the above, the voltage on the enrichment part is greater than that on the metal shell, so as to improve the enrichment efficiency and further improve the detection efficiency. Illustratively, the voltage applied to the enrichment part is 3000V and the voltage applied to the metal shell is 1000V.
Another embodiment of the invention discloses a method for detecting chemical components of nanoparticles, which comprises the following steps:
step 1: the control valve body is used for introducing the particles generated by the particle generator into the collection cavity, introducing sheath gas into the collection cavity and introducing protective gas into the metal shell;
step 2: opening the air pump to control the air pressure in the collection cavity;
and step 3: pushing the sampling rod to a third inlet on the side wall of the metal shell;
and 4, step 4: turning on a high-voltage and heating current power supply for providing high voltage for the enrichment part and heating the enrichment part and a voltage control power supply for providing high voltage for the metal shell, adjusting a high-voltage mode to enable the metal shell and the enrichment part to be charged oppositely to the particles, and adjusting the voltage of the voltage control power supply to enable the particles with the selected particle size to enter the metal shell for enrichment;
and 5: switching a high-voltage power supply and a heating current power supply to a heating mode, and pushing a sampling rod to be close to the detection device;
step 6: the particulate matter is converted into a gaseous state and enters a detection device for detection.
And 7: compare detection device's detected data and the actual composition of particulate matter, if detected data is in reasonable error range, then control valve body selects external atmosphere to detect, specifically as follows:
s1: introducing atmosphere with particles into the collection cavity, introducing sheath gas into the collection cavity, and introducing protective gas into the metal shell;
s2: opening the air pump to control the air pressure in the collection cavity;
s3: pushing the sampling rod to an inlet on the side wall of the metal shell;
s4: turning on a high-voltage and heating current power supply and a voltage control power supply, adjusting a high-voltage mode to enable the metal shell and the enrichment part to have opposite charges with the particles, and adjusting the voltage of the voltage control power supply to enable the particles with the selected particle size to enter the metal shell for enrichment;
s5: switching a high-voltage power supply and a heating current power supply to a heating mode, and pushing a sampling rod to be close to the detection device;
s6: the particulate matter is converted into a gaseous state and enters a detection device for detection.
Example 1
And opening the first high-pressure gas source 1, the second high-pressure gas source 2, the first flow controller 6 and the second flow controller 7, blowing off gas except the particles to be collected as protective gas when the gas enters the metal shell 9, and separating the single-particle-diameter particles as sheath gas when the gas enters the collection cavity 8. The third flow controller 16 and the suction pump 17 are opened for controlling the pressure in the collection chamber. By pushing the sampling rod 5 to a specific position, the valve body 14 can selectively measure the outside atmosphere or measure the known flow component particles generated by the particle generator 12. The particles are charged into the collection chamber by a charger 11. The voltage controlled power supply 4 is turned on to charge the metal casing while the first isolator 18 and the second isolator 19 ensure that they are not connected to the collection chamber wall and the detection device 10. The particle with specific particle size is selected by regulating the voltage, the high-voltage and heating current power supply 3 is turned on and is regulated to a high-voltage mode, the positive and negative voltages are opposite to the voltage applied by the voltage control power supply, and the power supply is connected with the enrichment part 13. The particulate matter is separated because of different particle size electric mobility difference under metal-clad high pressure and sheath gas sweeping effect, and the particulate matter of select particle size passes through the aperture and gets into in the metal-clad, and the enrichment is on applying highly compressed enrichment portion to accomplish the enrichment of particulate matter, particulate matter number concentration around can measuring the enrichment simultaneously through particle counter 15, thereby obtain enrichment efficiency. When detection is needed, a high-voltage power supply and a heating current power supply are switched to a heating mode, the push-pull sampling rod is pushed forwards to the front of the detection device, heating is started, and particulate matters are converted into a gas state to enter the detection device.
The system can realize continuous online particle size selection and thermal desorption of particles and realize particle size detection of chemical components of the particles, and meanwhile, an enrichment mode can be adopted to realize enrichment of particles with specific particle sizes and then detection and analysis are carried out.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. A nano-particle chemical component detection system is characterized by comprising a charging device, a particle size screening-enriching unit and a detection device which are sequentially connected;
the charging device is used for charging the nano-particles;
the particle size screening-enriching unit comprises a sampling rod, an enriching part, a metal shell and a collecting cavity, wherein the metal shell is arranged in the collecting cavity, one end of the sampling rod is arranged outside the collecting cavity, the other end of the sampling rod is connected with the enriching part and is arranged in the metal shell, and the metal shell and the enriching part are opposite to the nano-particles in charge;
a first inlet for allowing the nano-particles to pass through and a second inlet for allowing the gas to pass through are formed in the wall of the collecting cavity, a third inlet is formed in the wall of the metal shell, and the nano-particles pass through the third inlet and are enriched on the enrichment part;
the first inlet and the second inlet are respectively positioned on the side wall of the collection cavity and the end wall of the collection cavity far away from the detection device;
the second inlet is used for introducing sheath gas;
the detection device also comprises a first isolator and a second isolator which are used for isolating high voltage carried by the metal shell, wherein the first isolator is used for isolating the metal shell from the detection device, and the second isolator is used for isolating the metal shell from the collection cavity;
the valve body is arranged between the particle generator and the charging device and used for realizing the switching of a passage between the nano particles in the atmosphere and the nano particles generated by the particle generator;
the end part of the metal shell, which is far away from the detection device, is provided with a fourth inlet for protective gas to pass through, and the protective gas is used for blowing off gas except the nano particles.
2. The nanoparticle chemical composition detection system of claim 1, further comprising a suction pump for controlling pressure within the collection chamber, the suction pump in communication with the collection chamber.
3. The nano-particulate chemical composition detection system of claim 1, further comprising a particle counter in communication with the collection chamber, the particle counter for measuring a concentration of nano-particulates.
4. The nanoparticie chemical composition detection system of claim 1, wherein the first inlet is disposed on a sidewall of the collection chamber and the third inlet is disposed on a sidewall of the metal shell.
5. The nanoparticie chemical composition detection system of any of claims 2-4, wherein a voltage across the enrichment portion is greater than a voltage across the metal shell.
6. A method for detecting chemical components of nanoparticles, wherein the detection system of any one of claims 1 to 5 is used, comprising the steps of:
step 1: introducing atmosphere with nano particles and sheath gas into the collection cavity, and introducing protective gas into the metal shell;
step 2: pushing the sampling rod to a third inlet on the side wall of the metal shell;
and step 3: opening a first power supply which provides high voltage for the enrichment part and heats the enrichment part and a second power supply which provides high voltage for the metal shell, and adjusting a high-voltage mode to enable the metal shell and the enrichment part to be charged oppositely to the nano particles; adjusting the second power supply voltage to enable the nano-particles with the selected particle size to enter the metal shell for enrichment;
and 4, step 4: switching the first power supply to a heating mode, and pushing the sampling rod to be close to the detection device;
and 5: converting the nano-particles into a gas state, and detecting the gas state by a detection device;
step 1 is preceded by a calibration of the detection system comprising the steps of:
step a: the control valve body is used for introducing the particles generated by the particle generator into the collection cavity, introducing sheath gas into the collection cavity and introducing protective gas into the metal shell;
step b: opening the air pump to control the air pressure in the collection cavity;
step c: pushing the sampling rod to a third inlet on the side wall of the metal shell;
step d: turning on a first power supply which provides high voltage for the enrichment part and heats the enrichment part and a second power supply which provides high voltage for the metal shell, adjusting a high-voltage mode to enable the metal shell and the enrichment part to have opposite charges with the particles, and adjusting the voltage of the second power supply to enable the particles with the selected particle size to enter the metal shell for enrichment;
step e: switching the first power supply to a heating mode, and pushing the sampling rod to be close to the detection device;
step f: converting the particulate matters into a gaseous state, and detecting the gaseous state by a detection device;
step g: and comparing the detection data of the detection device with the actual components of the particles, and if the detection data are within a reasonable error range, controlling the valve body and selecting the external atmosphere for detection.
7. The method for detecting the chemical components of the nanoparticles as claimed in claim 6, further comprising turning on a suction pump to adjust the pressure in the collection chamber between the step 1 and the step 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910415014.2A CN109991133B (en) | 2019-05-17 | 2019-05-17 | Nano-particle chemical component detection system and detection method |
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| CN201910415014.2A CN109991133B (en) | 2019-05-17 | 2019-05-17 | Nano-particle chemical component detection system and detection method |
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| Publication Number | Publication Date |
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| CN109991133A CN109991133A (en) | 2019-07-09 |
| CN109991133B true CN109991133B (en) | 2020-11-13 |
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